IssueTracker

Component used: DialogFragment
Version used: 1.0.2
Devices/Android versions reproduced on: I did not reproduce it myself but I do have stack traces from Samsun/Huawei/Xiaomi Android 8 and 9

DialogInterface param of DialogFragment.onDismiss() function is marked as @NonNull
```


    @Override
    public void onDismiss(@NonNull DialogInterface dialog) {
        if (!mViewDestroyed) {
            // Note: we need to use allowStateLoss, because the dialog
            // dispatches this asynchronously so we can receive the call
            // after the activity is paused.  Worst case, when the user comes
            // back to the activity they see the dialog again.
            dismissInternal(true);
        }
    }
```

...but I've seen crashes in my app with stack traces showing that this param was null

```
Fatal Exception: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method l.w.d.j.b, parameter dialog
       at com.my.app.ui.dialog.MyCustomDialog.onDismiss + 88(MyCustomDialog.java:88)
       at android.app.Dialog$ListenersHandler.handleMessage + 1503(Dialog.java:1503)
       at android.os.Handler.dispatchMessage + 105(Handler.java:105)
       at android.os.Looper.loop + 164(Looper.java:164)
       at android.app.ActivityThread.main + 6944(ActivityThread.java:6944)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.Zygote$MethodAndArgsCaller.run + 327(Zygote.java:327)
       at com.android.internal.os.ZygoteInit.main + 1374(ZygoteInit.java:1374)
```

Dialog source code shows that the DialogInterface can be indeed null
https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/app/Dialog.java#1407

This is kind of problematic because the app written in Kotlin crashes and you can't really fix this without using Java code.
Kotlin does not allow us to mark DialogInterface as a nullable value.